body{
		margin: 0;
		padding: 0;
		background: #333;
		overflow: hidden;
	}
/* 隐藏画布外的内容 */
#canvas{
	height: 100%;
	width: 100%;
	overflow: hidden;
}
#canvas li,ul{
	list-style: none;
	margin: 0;
	padding: 0;
	height: 100%;
	overflow: hidden;
}
/* 使得图片居中 webkit-box */
#canvas li{
	position:absolute;
	display: flex;
	justify-content: center;
	align-items: center;
}
li img {
	height: 100%;
	width: 100%;
}
#bottom{
	position: fixed;
	width: 100%;
	height: 130px;
	border: solid 2px #eee;
	bottom: 0px;
}
#bottom li,ul{
	list-style: none;
	margin: 0;
	padding: 0;
	height: 100%;
	overflow: hidden;
}
#bottom li{
	float:left;
	border: solid 2px red;
}
.button{
	display: none;
	position: absolute;
	top: 50px;
	left: 50%;
	width: 30px;
	height: 30px;
	border: solid 1px blue;
}
